Phase-locked loop with charge distribution

Details Phase-locked loop with charge distribution Phase-locked loop with charge distribution

1996-05-02

1998-03-03

Callahan, Timothy P.

Oscillators

Automatic frequency stabilization using a phase or frequency...

Particular error voltage control

331 14, 331 17, 327157, H03L 7093

Patent

active

057240086

ABSTRACT:
According to the preferred embodiment, an improved feedforward path is provided that improves the frequency response and reduces the output jitter of a phase-locked loop. Specifically, the frequency response is improved by providing a zero in the frequency response of the phase-locked loop by means of a feedforward path. The feedforward path delivers a feedforward charge to the oscillator of the phase-locked loop. According to the preferred embodiment, the feedforward path reorders the feedforward charge, such that the feedforward charge is stored and distributed equally across all the phase-locked loop output signal sub-cycles.

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patent: 5552727 (1996-09-01), Nakao
patent: 5559474 (1996-09-01), Matsumono et al.
Ewen, J. F., Feed-Forward Compensation Circuit For Digital Random-Walk Filters, IBM Technical Disclosure Bulletin, Dec. 1988, pp. 455-458.

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